Transformer bracing



June 2,192 1,539,878

M. E. SKINNER TRANSFORMER BRACING File(1 y 12. 1919 i A rx J WITNESSES: INVENTOR 5 I BY ATTORNEY Patented June 2, 1925.

UNITED STATES PATENT. OFFICE.

MERRILL E. SKINNEB, OF WILKINSBURG, PENNSYLVANIA, ASSIGNOR 'IO WESTING- HOUSE ELECTRIC & KANUFACTURING COMPANY, A CORPORATION OF PENN- SYLVAN'IA.

TRANSFORMER BRACING.

Application filed Kay 12, 1919. Serial Io. 296,589.

To all whom it may concern: 7

B it known that I, MERRILL E. SKINNER,

a citizen of the United States, and a residentof Wilkinsbur in the county of Allegheny and State of enns lvania, have invented a new and useful former Bracings, of aspecification. 3 v v p My invention relates to transformers and it has especial relation to means for bracing the coils of apparatus of the character designated in such manner that the expansion or movement of the coils, under the action of heavy short-circuit stresses or otherwise, shall be prevented.

In the accompanying drawing, Fig.1 is a plan view of a transformer structure in which my im roved bracing means are employed; and ig. 2 is an elevational view of the structure shown in Fig. 1.

Heretofore, the coils in a paratus of the character desi ated have braced in such manner t at they were adequately secured against movement in a horizontal direction. It was thought that bracing in a vertical direction was unnecessary, because the core itself sup rted the coils in a satisfactory manner. 1th the increase in the capacity of transformers, however, an increasing tendenc for the coils to expand or move in the direction oftheir lon r dimension has been noticed, and difiicufg' has been experienced in so desi'gnin the coils that they should be able to wit nd the stresses imposed thereupon by short-circuits or otherwise and tending to displace them in a vertical direction. Again, in apparatus of this character, it is customary to inter-- pose between the coils, barriers of insulating material which are of a eater length than the coils themselves an therefore, extend somewhat above them. Such dimensions of theinsulating barriers are necessary to preclude short-circuits between the edges of adjacent coils. Obviously, therefore, it is difficult to provide bracing means across the tops and bottoms of the coils, because of the insulating barriers extending above and below them. Again,-the tendency for the coils to expand upwardly and downwardly is accentuated by the close restriction thereof in all horizontal directions.

I propose, therefore, to build up the ends of the coils with blocking members of such character and dimensions that bracing means mprovement .in Trans-- which the, following is ma be disposed above and below the coils an urged towards them without abrading or otherwise in'uring the insulating barriers which extend in which I accomplish this object, as well as other objects of my invention, will appear more in. detail'hereinafter.

' Referring more particularly to the drawing, a core member 1, having coils 22 associated therewith, is shown as mounted on a base member 3. End frames 4 and 5 secured together by means of tie rods 8 and 9 and plates 6 secured by tie bolts 7 are emloyed to brace the coils against movement in a horizontal direction. Between the coils are positioned insulating barriers 1010. It will be noted that'the barriers 10 extend somewhat be ond the tops and bottoms of the coils 2. lock members 11- 11 are positioned'on the coil edges and are of suc mansions that they are flush with the tops and bottoms of the insulating barriers 10.

Extending in a direction transverse to the coil ed and resting upon the ed of the insulating barriers 10 and the blocking members 11-11, are beams 1212 which are secured to, and urged toward, the end frames 4 and 5 by tie rods 13-13. Gross piecesl and 15 serve to strengthen the end bracing structure. As illustrated, the beams 12r12 are seated in channels 16-16 of insulating ,material, which serve to more efliciently electrically separate the coils from their associated bracing means. It is apparent that, by use of the blocking members interposed etween them. The manner between the beams and the coils, the beams may be urged toward the coils by tightening the tie bolts 13 and the coils be thereby rigidly secured against any tendency to'expand in a vertical direction.

While I have shown but one embodiment of my invention, it is apparent that many other modifications in a vertical bracing system may occur to those sl illed in the art and I, therefore, desire that only such limitations shall be placed thereupon as are imposed by the prior art or by the scope of the appended claims.

I claim as my invention:

1. In a transformer, a core member, coils associated with the core member, insulating members between the coils and extending beyond the ends thereof, end-frame bracing means, additional bracing means comprising members extending across the tops and botcomprising beams extending across the tops toms of said coils in a direction perpendicular to the planes thereof and secured to the end frames, and blockmembers disposed between the coils and said last-named bracing and bottoms of the coils in a direction perpendicular to the planes thereof, the ends of said beams being secured to the end frames.

4. In a transformer, a core member, coils inductively related thereto, end-frame bracing means, and additional bracing means comprising beamsextending across the tops and bottoms of the coils in a direction perpendicular to the planes thereof, the ends of said beams being secured to the end frames, and blocking means between the coil tops and bottoms and the beams, whereby the short coils receive the same pressure as therelatively longer intermediate insulating members.

In testimony whereof, I have hereunto subscribed my name this 26th day of April 1919.

MERRILL E. SKINNER. 

